Leases - Summary of Operating Lease Liability Activity (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Summary Of Operating Lease Liability Activity [Roll Forward]
Operating lease, liability, beginning balance	$ 0
Transition adjustment recorded upon adoption	8,289
Payments during the period	(1,374)
Effect of discounted cash flows during the period	234
Operating lease, liability, ending balance	$ 7,149